(19)
(11) EP 1 372 145 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.09.2004 Bulletin 2004/40

(43) Date of publication A2:
17.12.2003 Bulletin 2003/51

(21) Application number: 02256846.3

(22) Date of filing: 02.10.2002
(51) International Patent Classification (IPC)7: G11B 7/09
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 24.05.2002 KR 2002028922

(71) Applicant: SAMSUNG ELECTRONICS CO., LTD.
Suwon-City, Kyungki-do (KR)

(72) Inventors:
  • Lee, Jin-won
    Bundang-gu, Seougnam-si, Gyeonggi-do (KR)
  • Kim, Kwang
    Paldal-gu, Suwon-si, Gyeonggi-do (KR)
  • Cheong, Young-min
    Dobong-gu, Seoul (KR)

(74) Representative: Chugg, David John et al
Appleyard Lees, 15 Clare Road
Halifax, West Yorkshire HX1 2HY
Halifax, West Yorkshire HX1 2HY (GB)

   


(54) Actuator for optical pickup


(57) An actuator for an optical pickup is provided. The actuator for an optical pickup so as to drive a support (20), on which an objective lens (10) is mounted, in focusing and tracking directions includes a pair of magnets (50) installed on a base (40), and a plate coil (60) installed in the support (20) to be placed between the magnets (50). Each magnet has a shape in which N and S poles of the magnet are alternately magnetized in four regions asymmetrically split vertically and horizontally. In the above structure, the actuator for an optical pickup can be less affected by sensitivity variations when the support is displaced, and the size of the electromagnetic driving unit can be reduced by reducing the number of magnetized gaps formed on the magnet.









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